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Allowance for Credit Losses and Reserve for Unfunded Lending Commitments - Allowance for Loan and Lease Losses and Reserve for Unfunded Lending Commitments Activity (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     $ 7,208  
Provision for credit losses $ 331 $ 1,383 10,000 $ 4,418
Balance at the end of the period 16,129   16,129  
Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 16,832 7,133 7,208 7,220
Charge-offs (1,679) (2,086) (6,267) (6,516)
Recoveries 606 624 1,898 1,947
Net charge-offs (1,073) (1,462) (4,369) (4,569)
Provision for credit losses 356 1,374 9,975 4,387
Allowance build (release) for credit losses (717) (88) 5,606 (182)
Other changes 14 (8) 8 (1)
Balance at the end of the period 16,129 7,037 16,129 7,037
Allowance for credit losses | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     2,845  
Allowance for credit losses | Finance charge and fee reserve reclassification        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     462  
Allowance for credit losses | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     10,515  
Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 218 144 135 122
Provision for credit losses (23) 9 23 31
Balance at the end of the period 195 153 195 153
Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     37  
Reserve for unfunded lending commitments | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     172  
Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 16,324 7,190 16,324 7,190
Credit Card | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 12,091 5,342 5,395 5,535
Charge-offs (1,296) (1,531) (4,757) (5,024)
Recoveries 353 380 1,167 1,189
Net charge-offs (943) (1,151) (3,590) (3,835)
Provision for credit losses 450 1,087 7,096 3,571
Allowance build (release) for credit losses (493) (64) 3,506 (264)
Other changes 14 (8) 8 (1)
Balance at the end of the period 11,612 5,270 11,612 5,270
Credit Card | Allowance for credit losses | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     2,241  
Credit Card | Allowance for credit losses | Finance charge and fee reserve reclassification        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     462  
Credit Card | Allowance for credit losses | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     8,098  
Credit Card | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 0 0 0 0
Provision for credit losses 0 0 0 0
Balance at the end of the period 0 0 0 0
Credit Card | Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Credit Card | Reserve for unfunded lending commitments | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Credit Card | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 11,612 5,270 11,612 5,270
Consumer Banking | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 2,838 1,055 1,038 1,048
Charge-offs (295) (489) (1,207) (1,383)
Recoveries 247 238 721 739
Net charge-offs (48) (251) (486) (644)
Provision for credit losses (43) 203 1,693 603
Allowance build (release) for credit losses (91) (48) 1,207 (41)
Other changes 0 0 0 0
Balance at the end of the period 2,747 1,007 2,747 1,007
Consumer Banking | Allowance for credit losses | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     502  
Consumer Banking | Allowance for credit losses | Finance charge and fee reserve reclassification        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Consumer Banking | Allowance for credit losses | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     1,540  
Consumer Banking | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 0 4 5 4
Provision for credit losses 0 0 0 0
Balance at the end of the period 0 4 0 4
Consumer Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     (5)  
Consumer Banking | Reserve for unfunded lending commitments | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Consumer Banking | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 2,747 1,011 2,747 1,011
Commercial Banking | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 1,903 736 775 637
Charge-offs (88) (66) (303) (109)
Recoveries 6 6 10 19
Net charge-offs (82) (60) (293) (90)
Provision for credit losses (51) 84 1,186 213
Allowance build (release) for credit losses (133) 24 893 123
Other changes 0 0 0 0
Balance at the end of the period 1,770 760 1,770 760
Commercial Banking | Allowance for credit losses | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     102  
Commercial Banking | Allowance for credit losses | Finance charge and fee reserve reclassification        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     0  
Commercial Banking | Allowance for credit losses | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     877  
Commercial Banking | Reserve for unfunded lending commitments        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period 218 140 130 118
Provision for credit losses (23) 9 23 31
Balance at the end of the period 195 149 195 149
Commercial Banking | Reserve for unfunded lending commitments | Cumulative effects from adoption of the CECL standard        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     42  
Commercial Banking | Reserve for unfunded lending commitments | Balance as of January 1, 2020        
Allowance for Credit Losses [Roll Forward]        
Balance at the beginning of the period     172  
Commercial Banking | Combined allowance and reserve        
Allowance for Credit Losses [Roll Forward]        
Balance at the end of the period 1,965 $ 909 1,965 $ 909
Partnership Credit Card Loan Portfolio | Allowance for credit losses        
Allowance for Credit Losses [Roll Forward]        
Allowance build (release) for credit losses $ (327)   $ (327)